ShowWhen

[showWhen]

The showWhen attribute takes a string that represents a platform or screen orientation.
The element the attribute is added to will only be shown when that platform or screen orientation is active.

Complements the hideWhen attribute. If the showWhen attribute is used on an
element that also has the hideWhen attribute, the element will not show if hideWhen evaluates
to true or showWhen evaluates to false. If the hidden attribute is also added, the element
will not show if hidden evaluates to true.

View the Platform API docs for more information on the different
platforms you can use.